MongoDB - Aggregation Framework (Total Count)

Question

When running a normal \"find\" query on MongoDB I can get the total result count (regardless of limit) by running \"count\" on the returned cursor. So, even if I limit to re

Answer 1

I got the same problem, and solved with $project, $slice and $$ROOT.

db.article.aggregate(
{ $group : {
    _id : '$author',
    posts : { $sum : 1 },
    articles: {$push: '$$ROOT'},
}},
{ $sort : { posts: -1 } },
{ $project: {total: '$posts', articles: {$slice: ['$articles', from, to]}},
).toArray(function(err, result){
    var articles = result[0].articles;
    var total = result[0].total;
});

You need to declare from and to variable.

https://docs.mongodb.com/manual/reference/operator/aggregation/slice/